Propeller-guard.



J. L. HAWTHORNE.

PROPELLER GUARD.

APPLICATION FILED MAY 22, 1909.

Patented Mar. 8, 1910.

2 SHEEN-SHEET 1.

l/Vl/E/VTOR 1047212 LJiaw'Z/wrne WITNESSES ATTORNEYS Mi M J. L. HAWTHORNE; PROPELLBR GUARD. APPLIOATION FILED MAY 22, 1909.

mama M21128, 1910.

2 SHEETB-SHBET 2.

0701 172 Lfiawl/mrne BY safely over.

and engages in the swiveled loop;

' NITED srmras PATENT OFFICE.

i JOHN LEWIS rrnwrnonnu, or rnrnnson. NEW JERSEY.

' PROPEELER-GUARD.

Specification of Letters Patent.

' ratenteanaas, 1910.

To all whom it may concern:

lie-it known that I, Jorm L. HAWTHORNE, a citizen of the United States, and a resident of Paterson, in the county of Fassaic and State of New Jersey, have invented a new and Improved Propeller Guard, of

'which the following is a full, clear, and

- peller shaft. To overcome this have designed a propelle r'guard which in general consists of a frame extendin 'heneath the propeller shaft and propeller, oththe shaft and guard being supported to swing upwardly when the guard strikes an obstruction, thus allowing the propeller to ride Reference is to be had a; the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a side elevation of a motor boat partly in central vertical section, showing my improved propeller guard applied thereto and in a position to swing upwardly with the propeller in passing over a, rock; Fig." 2 is a similar view of the guard-and ropeller on an enlarged scale; Flg. 3 is an.

inverted plan of the guard and propeller;

Fig. 4 is a cross-section of the same on the line H of Fi 2, looking in the direction ig. 5 is a sectional view of of the arrow; the swiveled loop and its connection with the propeller shaft; Fig. 6 is an. inverted plan of the construction shown in Fig. 5;

ig 7 isan outer end view of the curved shaft Fi 8 is a fra entary sectional view on the me 8-8 of ig. 1. a At the stern of the boat at each side of the keel brackets 10, are-bolted or otherwise secured. In these brackets are journaled stub shafts or trunnions 11 attached to an approximately U-shaped-frame 12, the frame extendingrearwardly a substantial distance, where it isrigid with a centrall -located bearin 13, which bearing is additionally arm which is carried by the driving .and pivotally supported on a'post14 rig idly secured to a ropeller-guard 15. The

Application filed May 22, 1999. Serial No, 497,706.

ports for ivoting the frame 12, "each has an inward y-projecting finger 16 which-extends under. the adjacent arm of the frame and limits itsdownward pivotal movement. .Journaled in the bearing 13 is the propeller shaft 17 having the propeller 18 secured at its outer end, and at ts lnner end having an attached collar 19, as shown in detail in Figs. 5 p and 6, the collar beingprovided with a stud 20 on which is swiveled a loop 21. An outwardly-curved-arm 22 projects into the loop and is rigid with a co lar 23, which in turn is attached to the outer end of the driving shaft 24 at the outside of, the

stern stuthn -box.

The guar 15, as shown in, Figs. 3 and 4, is made up ofa-number of longitudinal bars, three bein shown, which extend the full length of t e-propeller shaft and are turned upward slightly at their outerends at the" rear .of'tlie propeller. These bars are all rigidly secured together intermediate their length, as shown in Fig. 3, by the baselate of the post 14, and at the inner end o the guard the outer bars are bifurcated to receive the lower ends -of links 25 which are pivoted thereto, the'upper ends of the links being pivoted to the inner ends of the arms of the frame 12 on the shafts 11, as shown in Fig. 8. Thepivotins 15 which connect the bars of the guard rame to the links, also pass through lon itudinallyslotted links 26 which are pivota y supported at their inner ends on brackets 27 by a cross-bolt 28, the bolt passing through a centrally-arranged link 26 in all respects the same as the links 26 and likewise plvoted to the inner end of the central uide-bar of the propeller guard by a in orholt 15". f

7 Or inarily, the weight of the'parts is sufficient to hold the propeller and guard to the lower limit of its movement, as shown in 2. In order, however, to insure a positive return of the propeller to this pos tion after assing over an obstruction, and to minimize the vibration in so far as possible,

ll -attach tothe u per edges of the brackets tion of its swinging movement. When the' boat passes over a rock or other obstruction in the path of the propeller, the obstruction, if submerged sufliciently to clear the keel, in which event the boat proper passes over without striking, the guard strikes the rock and is raised, carrying with it the propeller shaft and propeller, all of which are quickly returned by the Weight of the parts and the spring after the rock has been cleared. lVhen the guard 15 swings upwardly, the connected ends of the guard-bars and links move outwardly on the slotted links 26, while the latter swing on their own pivots to render this movement of the guard possible. In order that the steering of the boat may not be impaired by reason of the guard, I provide two rudders 30, which are swingingly mounted on the boat at opposite sides of the guard and operatively connected by a strap 31, as shown in Fig. 3, in order that they may be swung in unison.

Having thus described my invention, I claim as new and desire to secure by Letters Patent .inner end on the boat adjacent to the outer end of the driving shaft, links pivoted to the boat below the frame, a bearing carried by the frame, and a guard operatively con-- nected to the links and to the bearing.

3. In combination with a boat, a driving shaft, a guard pivotally supported at its inner end to the boat, a bearing connected to and arranged above the'guard, a propeller shaft'journaled in the bearing, an arm fixed to and extending outwardly from the driving shaft, and a swiveled loo fixed to the inner end of the propeller shaft and engaging said arm.

4. In combination with a boat, a driving shaft, a frame pivotally supported at its inner end adjacent to the outer end of the driving shaft and having a' bearing on the outer portion thereof, a propeller shaft journaled in the bearing, means operatively connecting the propeller shaft and the driving shaft, links pivotally supported at their inner ends below the frame, links arranged between the frame and the first mentioned links, and a propeller guard supported at' its inner end on the two sets of links and operatively connected to said bearing.

5. In combination with a boat, a driving shaft, brackets secured to the boat adjacent to the outer end of the driving shaft, a frame pivotally supported at its inner end on the brackets, a bearing, a propeller shaft journaled in the bearing and operatively connected to the driving shaft, a guard pivotally supported at its inner end below the propeller shaft and operatively connected to the bearing, stops projecting from the brackets underneath the frame to limit the downward movement of the propeller shaft and guard, and a spring bearing on the frame and forcing it. to the stops.

6. In combination with a boat, a driving shaft, brackets secured to the boat adjacent to the outer end of the driving shaft, a frame pivotally supported at its inner end on the brackets and havin a bearing, a propeller shaft journaled 1n the bearing and operatively connected to the driving shaft, links suspended on the frame adjacent to the brackets, links pivotally supported at their inner ends, a guard pivotally connected to the first mentioned links and slidably and pivotally connected to the last mentioned links, and means operatively connecting the guard to the bearing.

7. In combination with a boat, a driving shaft, brackets secured to the boat adjacent to the outer endof the driving shaft, a frame pivotally supported at its inner end on the brackets and having a bearing, a propeller shaft journaled in the bearing and operatively connected to the driving shaft, links suspended on the frame adjacent to the brackets, slotted links pivoted at their inner ends to the boat, a guard having a member pivotally connected to the bearing, and pivot pins connecting the inner end of the guard to the first mentioned links and slidable in the slots of the last mentioned links.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN LEWIS HAWTHORNE.

Witnesses:

JOHN RICKER, CHARLES SIEFERT. 

